Flora of North America species comparison

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Pseudognaphalium macounii

Pseudognaphalium viscosum

gnaphale de Macoun, Macoun's cudweed, Macoun's everlasting, Macoun's rabbit-tobacco, sticky cudweed, winded cudweed, wing cudweed

sticky rabbit-tobacco, wing cudweed
Habit Annuals or biennials (often sweetly fragrant), 40–90 cm; taprooted. Annuals (viscid and unpleasantly aromatic), 30–100 cm; taprooted.
Stems

stipitate-glandular throughout (usually persistently lightly white-tomentose distally).

persistently white-tomentose and stipitate-glandular.
Leaf

blades (not crowded, internodes mostly 5+ mm) lanceolate to oblanceolate, 3–10 cm × 3–13 mm (distal linear), bases not clasping, decurrent 5–10 mm, margins flat to slightly revolute, faces weakly bicolor, abaxial tomentose, adaxial stipitate-glandular, otherwise glabrescent or glabrous.

blades (crowded, internodes mostly 1–3, sometimes to 10, mm) linear-lanceolate, (2–)4–8 cm × 3–10 mm, bases not clasping, usually (at least the proximal) decurrent 3–10 mm, margins strongly revolute to revolute-undulate, faces bicolor, abaxial densely white-tomentose, adaxial densely stipitate-glandular.
Involucres

campanulo-subglobose, 4.5–5.5 mm.

campanulate, 5–6 mm.
Pistillate florets

47–101(–156).

200–250.
Bisexual florets

5–12[–21].

(13–)16–29.
Phyllaries

in 4–5 series, stramineous to creamy (hyaline, shiny), ovate to ovate-oblong, glabrous.

in 5–6 series, tawny-silvery to silvery white (hyaline, shiny), ovate-lanceolate (not keeled or thickened along midribs, not apiculate), glabrous.
Heads

in corymbiform arrays.

in corymbiform arrays.
Cypselae

not ridged, ± papillate-roughened.

not ridged, papillate-roughened.
2n

= 28.

Pseudognaphalium macounii

Pseudognaphalium viscosum
Phenology Flowering July–Oct. Flowering Jul–Sep.
Habitat Dry, open habitats, pastures, open woods or edges, roadsides Rocky open sites, roadsides
Elevation 50–2600(–3000) m (200–8500(–9800) ft) 1400–1800 m (4600–5900 ft)
Distribution
from FNA
AZ; CA; CO; CT; ID; IL; IN; MA; ME; MI; MN; MT; NH; NM; NY; OH; OR; PA; SD; TN; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NS; ON; PE; QC; SK; Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
TX; Mexico; Central America
[WildflowerSearch map]
[BONAP county map]
Discussion

Pseudognaphalium macounii is recognized by its stipitate-glandular, proximally glabrescent stems, bicolor and decurrent leaves, relatively large and many-flowered heads, and hyaline, shiny phyllaries. Reports of P. macounii from Texas are based on specimens of P. viscosum.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Reports of Pseudognaphalium viscosum from the flora for states other than Texas are based on plants of P. macounii. Pseudognaphalium viscosum is similar to P. leucocephalum, which has broader and white-opaque phyllaries, longer bisexual corollas, and smooth cypselae.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 421. FNA vol. 19, p. 422.
Parent taxa Asteraceae > tribe Gnaphalieae > Pseudognaphalium Asteraceae > tribe Gnaphalieae > Pseudognaphalium
Sibling taxa
P. arizonicum, P. austrotexanum, P. beneolens, P. biolettii, P. californicum, P. canescens, P. helleri, P. jaliscense, P. leucocephalum, P. luteoalbum, P. micradenium, P. microcephalum, P. obtusifolium, P. pringlei, P. ramosissimum, P. roseum, P. saxicola, P. stramineum, P. thermale, P. viscosum
P. arizonicum, P. austrotexanum, P. beneolens, P. biolettii, P. californicum, P. canescens, P. helleri, P. jaliscense, P. leucocephalum, P. luteoalbum, P. macounii, P. micradenium, P. microcephalum, P. obtusifolium, P. pringlei, P. ramosissimum, P. roseum, P. saxicola, P. stramineum, P. thermale
Synonyms Gnaphalium macounii, Gnaphalium decurrens Gnaphalium viscosum
Name authority (Greene) Kartesz: in J. T. Kartesz and C. A. Meacham, Synth. N. Amer. Fl., nomencl. innov. 30. (1999) (Kunth) Anderberg: Opera Bot. 104: 148. (1991)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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